Freiburg 2008 – scientific programme

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T: Fachverband Teilchenphysik

T 70: Beschleunigerphysik II

T 70.7: Talk

Thursday, March 6, 2008, 18:15–18:30, KGI-HS 1019

Spurious Dispersion Effects at FLASH — •Eduard Prat — DESY, Hamburg, Germany

FLASH (Free Electron LASer in Hamburg) is a SASE FEL user facility at DESY, Hamburg. It serves also as a pilot project for the European XFEL. For an optimal FEL performance, the beam size in the undulator should not be increased by dispersive effects. Sources of the (spurious) dispersion are field errors and stray magnet fields in the undulator beam line as well as spurious dispersion created upstream of the undulator by, for instance, rf coupler kicks, magnet misalignments and field errors. The impact of these errors on dispersion generation depends on the actual operating conditions of the accelerator, so the dispersion must be measured and controlled frequently. A method to correct dispersion will be described, and dispersion measurements and correction results at FLASH will be presented. Finally, simulations of the dispersion effects on the FEL performance will be presented.